Motor pump unit



April 1941- R. T. CORNELIUS MOTOR PUMP UNIT Fild April 17. 19:59

2 Sheets-Sheet 1 argue/ hom April 1, 1941. R. T. CORNELIUS vllO'fOR PUMPUNIT Filed April 17-, 1939 2 Sheets-Sheet 2 Richard T. CorneliusPatented Apr. 1, 1941 NETE STATES PATENT orrics Claims.

My invention relates to motor pump units and has for an object toprovide an exceedingly simple and compact construction by means of whichcompressed air may be readily procured.

Another object of the invention resides in utilizing a fan for coolingthe motor and pump and in directly connecting the crank for operatingthe pump to the fan.

Another object of the invention resides in utilizing a ball bearing forthe end of the motor shaft driving the pump and in utilizing the fan insecuring the bearing to the motor shaft.

A still further object of theinvention resides in utilizing the fan fordrawing air through the motor to cool the same and discharging the airagainst the pump to cool the pump.

A feature of the invention resides in providing a hollow base for themotor pump unit open at the lowermost portion thereof and in arrangingthe operating mechanism for the pump within the base.

Another object of the invention resides in constructing the motor pumpunit so as to completely avoid the use of pipes, tubes or fittings forconnecting the compression chamber with the control device and outlet ofthe motor pump unit.

Other objects of the invention reside in the novel combination andarrangement of parts and in the details of construction hereinafterillustrated and described.

In the drawings:

Fig. l is a plan view of a motor pump unit illustrating an embodiment ofmy invention.

Fig. 2 is an elevational sectional View taken on line 22 of Fig. 1.

Fig. 3 is a plan sectional View taken on line 33 of Fig. 2.

My invention comprises a motor H! of the vertical shaft type which ismounted on a base H. Within the said base is provided a pump l2 whichincludes a valve mechanism l3 attached to the base ll. Associated withthe valve mechanism 13 is a control device 14 by means of which thepressure procured by the pump I2 may be regulated. These various partswill now be described in detail.

The base I l consists of a skirt I5 which is open at the bottom and isclosed at the top through a horizontally extending wall H5. The base Hhas secured to the lowermost portion thereof four feet H, which arepreferably constructed of rubber or some suitable material by means ofwhich the motor pump unit is supported and which serve to hold the loweredge 18' of the base ll above the surface on which the unit rests. Bymeans of the feet I! passageways 19 are provided whereby air may bedrawn from the exterior and into the chamber 2i, formed within the basell.

The motor 10 consists of a housing 22 having a cylindrical wall 23 andan end wall 24 connected therewith. The wall 23 is provided with anannular groove 25. A lip 26, formed on the up=- per edge of the skirtll: of base I l is seated within the groove 25 and holds the housing 22centered with respect to the base H. The housing 22 is attached to thebase H by means of screws 21 which extend through the wall 24 of saidhousing and are threaded into the wall 16 of base H.

Within the housing 22 is mounted the core 28 of motor H] which issupported within said housing on the screws 21 and which is held inposition within said housing by means of spacers 29 mounted on thescrews 21. This core carries the usual windings 31 which have not beenshown in detail and which form no particular feature of the invention.Rotatably mounted within the core 28 is a rotor 32 which is mounted on ashaft 33. This shaft is journalled at its upper end by means of a ballbearing 34 having an inner race-35 and an outer race 36. Race 36 isreceived within a socket 31, formed on a boss 38 cast integral with thewall 24 of housing 22 and projectinginwardly into the said housing. Therace 35 fits upon the extreme end 39 of the shaft 33. The race 36 fitssufiiciently free with respect to the Socket 3'! with which it isassociated so that the bearing may float longitudinally.

The lower. end of the shaft 33 is supported in a similar manner. Thisend of the shaft is formed with an enlarged portion 4| which'is reducedas indicated at 42 to form a shoulder 43 at such locality. The portion42 of shaft 33 has mounted on it a ball bearing 44 which comprises aninner race 45 and an outer race 46. The race 46 is received within asocket 41 formed in a bo'ss48, cast in the wall I6 of base II. This raceis securely clamped in position within said socket by means of anannular plate 49 which is held attached to the boss 48 by means ofscrews 51. The inner race of ball bearing 44 butts against the shoulder43 and is held in position against said shoulder by means of a featureof the invention to be presently more fully described.

Within the'chamber 2| in base H is provided a fan or blower rotor 52which is constructed with a disc 53 having a hub 54 at the center of thesame. The hub 54 is threaded, as designated at 55, to receive thethreaded end 56 of the shaft 33. The hub 54 is constructed with ashoulder 51 which is adapted to engage against the outer end of the race45. When the boss 54 is screwed upon the threaded end 56 of shaft 33,the said boss firmly clamps the race 45 of hearing 44 in position uponsaid shaft and at the same time rigidly holds the fan 52 mounted on thesaid shaft. The fan 52 has a number of blades 58 and 59 formed on thesame which are arranged near the outer periphery of the fan and whichserve to circulate air. The portion of the fan, adjacent the hub 54 isconstructed without blades to provide a central chamber 6| free fromblades. The wall 24 of housing 22 is constructed with a plurality ofannularly dispose'd'ventilation openings 62 which are arranged inproximity to the windings 3| on the core 28. The wall I6 of base II isconstructed with a number of openings 63 which are arranged in closeproximity to the hub 48 and which communicate with the chamber 6|. Itwill readily be comprehended that, as the motor I operates, the fan 52functions to draw air in through the openings 62 past the windings 3|,along the core 28 and through the openings 63 into the chamber 6|. Inthis chamber the air is thrown by centrifugal force outwardly where thesame follows along 1 sition by means of a case 66 which has a flange 74061 projecting outwardly therefrom and which overlies the marginalportion of said diaphragm. A number of screws 68 extend through the saidflange and diaphragm and clamp the diaphragm in position. Forreciprocating the diaphragm a connecting rod II is employed which isconstructed at one end with a conical shaped head I2. This head fitsadjacent the diaphragm 65 on one side thereof. The other side of saiddiaphragm is provided with a plate I3. Screws I4 extend jointly throughsaid plate and diaphragm and are threaded into the head I2. By means ofthis construction the connecting rod II is rigidly secured to thediaphragm. The opening 69 is of suitable dimension to receive the headI2 and permits of reciprocating the diaphragm. The connecting rod II isconstructed at its other end with a boss 14 which is bored to receivethe outer race I5 of a ball bearing 16. The end of the boss 14 is splitas indicated at 11 and a bolt I8 extending through the same clamps thesaid boss securely upon the race 15 holding the ball bearing I6 rigidlyattached to the connecting rod. The inner race I9, of the ball bearingI6, is

mounted on a stub shaft 8| issuing outwardly from the disc 53 of fan 52.This stub shaft is cast integral with said disc and is constructed toprovide a shoulder 82 encircling the same where the said shaft issuesfrom the fan 52. The stub shaft 8| is threaded as designated at 83 toreceive a screw 84. A washer 85 encircles said screw and bears up theouter end of the race 19 of bearing I6. When the screw 84 is tightenedthe race 19 of bearing I8 is rigidly clamped in position, It will thusbe readily comprehended that the connecting rod II is reciprocated asthe shaft 33 rotates. For the purpose of counter balancing the weight ofthe rotating portion of the connecting rod 1| and the stub shaft 8| andbearing 16 the blades 59 are constructed somewhat thicker than theblades 58 which increases the Weight of fan 52 on the side thereofopposite the stub shaft 8|.

All of the bearings 34, 44 and I6 may be of the sealed type being packedwith lubricant and requiring no attention until worn out. If desired.however, any other type of bearing may be employed. By constructing thestub shaft 8| integral with fan 52, lost motion between the variousmoving parts of the motor pump unit is reduced to a minimum.

The case 66 is part of valve mechanism I3 and is counter-sunk at the endof the same opposite the diaphragm 65 to provide a chamber 86 into whichthe diaphragm is moved as the connecting rod II is reciprocated. Thisconstitutes the compression chamber of the pump into and from which theair is drawn and forced. At the outer end of the case 66 is provided achamber 81 which is open to the exterior. Encircling this chamber nearthe outer end thereof is a shoulder 88. A plate 89 is seated againstthis shoulder which plate is constructed to provide open ings 9|, nearits periphery, which conduct air from the exterior and into the chamber81. A pad 92 of filter material overlies the plate 89. An outer plate 93overlies the pad 92 and is formed with an opening 94 at the center ofthe same. This plate is held in place by means of a ring 95 which isreceived in a groove 96 in the case 66 near the outer end of the same.By means of this construction air enters through the hole 94, isfiltered through the pad 92 and finally enters into the chamber 81through the openings 9|.

The inlet valve of the pump is designated by the reference numeral 9'!and is adapted to be seated against a seat 98 encircling a passageway 99extending between the chamber 86 and the chamber 81. An unloader spring|0I normally holds the valve 91 open until the speed of the motor I0 issufiicient to efficiently operate the pump.

The outlet valve of the pump is designated by the reference numeral I02.This valve is adapted to be seated against a seat I03, formed on amember I04, mounted in a bore I06 in the case 66. This bore communicateswith the chamber 86 and also with the passageway in a hose connectionI01 tapped into the case 66 and shown in Fig. 1. The bore I06 isthreaded as indicated at I08. A plug I09 is screwed into the threads I08and holds the member I04 in place. This plug also forms a stop forlimiting move ment of the valve I02. The end of the bore I06 is closedby a cap III which is screwed into the threads I08. The cap III isspaced from the plug I09 to provide a chamber I I2 within said boreintermediate the ends thereof. A hole 3 drilled through the said plugbrings the interior of the valve chamber into communication with thechamber II2.

The control device II4 may be constructed in any suitable manner such asis well known in the art and the details of construction thereof willhence not be described in this application. This device includes a case|I5 which is provided with a nipple I I 6 which is screwed into the case66. This nipple brings the mechanism of the device I 4 intocommunication with the charm ber H2. The device 14 includes a pressureregulating valve and an electrical switch operated thereby by means ofwhich the motor It) may be energized and de-energized depending upon thepressure within the chamber H2. The pressure desired may be variedthrough an adjusting screw ll'l.

The operation of the device is as follows: When the motor switch isfirst operated, and atmospheric pressure occurs in chamber N2 the switchin the control device M is closed andthe motor becomes energized. Theshaft 33 then rotates and fan 52 and connecting rod H are operated. Asthe stub shaft 8| rotates, diaphragm 65 is reciprocated and the pump l2set into action. Due to the fact that the valve 91 is normally open, theair is drawn into and out of the passageway 99 without pumping. As soonas the motor reaches a sufiiciently high speed, the velocity of the airtraveling past the said valve is sufficient to close the valve andpumping then continues. The air drawn into the chamber 85 is dischargedpast the valve m2 and enters the chamber H2. At the same time the airpumped is forced through the passageway of the hose connection [01. Whenthe pressure in chamber H2 reaches a predetermined amount, the switchoperated by the control device I4 cuts ofi and the motor H) stops.During operation of the motor the fan 52 draws air through the openings62 in the end wall 24 of housing 23, causes the said air to travel pastthe core 28 and windings 2i and discharges the same through the openings63 in the wall l6 and into the chamber 64 in fan 52. Fan 52 bycentrifugal force throws the air outwardly. Part of the air is. directedagainst the head #2 of pump I2 and also against diaphragm 55 thereof.This air, as well as cooling the motor, removes part of the heat fromthe diaphragm and thus keeps the same cooled. The air, on leaving thefan 52, follows along the inner surface of the wall 16 and skirt l ofbase II and is discharged through the opening l9.-

As the air rises, the same follows along the exterior of the skirt [5and around the case 66 and further tends to cool all of the parts of themotor pump unit.

The advantages of my invention are manifest. An extremely simple andpractical construction is provided for the compressing of air. Thesingle fan employed serves to conduct through the motor pump unit theair necessary for cooling all of the parts associated therewith. Thisfan, in addition, forms a single member for rigidly securing and holdingthe parts attached to one another so as to minimize the lost motionbetween the moving parts of the motor pump unit. By constructing thestub shaft integral with the fan a rather small degree of eccentricitycan be procured and no lost motion between the said shaft and the hub ofthe fan is produced. Due to the fact that the hub of the fan buttsagainst the inner race of the bearing for journalling the motor shaft,relative movement between the bearing and shaft is prevented. By thearranging of parts shown it becomes unnecessary to employ tubing or toprovide pipe connections externally of the device or to provide ductsexposed externally of the device. By means of the arrangement shown thebase for the pump serves as a housing for containing the moving parts ofthe invention which are read ily accessible and are protected thereby.

Changes in the specific form of my invention,v

as herein disclosed, may be made within the scope of what'is claimedwithout departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protectby Letters Patent is:

1. In a motor pump unit, a driven shaft, a disc secured to said shaft,bladesissuing from said disc and integral therewith, a stub shaft formedon the opposite side of the disc and integral therewith, said stub shaftbeing eccentric relative to saiddriven shaft, and a connecting rodpivoted to said stub shaft and operating the pump, said bladeson theside of said disc opposite said stub shaft being heavier than the bladeson'the side of said disc on which the stub shaft is disposed.

2. In a motor pump :unit, a driven shaft, a disc secured to the end ofsaid shaft, blades issuing from said disc and disposed inwardly of theend of the shaft, a stub shaft formed on the opposite side of said discand a connecting rod pivoted to said stub shaft and operating the pump.

3. In a motor pump unit, a base including a skirt provided with adischarge opening at the lowermost portion thereof and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured tothe upper portion of said base and having a. driven shaft extendingthrough said wall, a fan secured to the protruding end. of said shaftand disposed adjacent said wall, said fan causing circulation of airalong said wall and downwardly along said skirt and out .of thedischarge opening thereof, a pump mechanism carried by said base andmeans driven by said fan for operating said pump mechanism.

4. In a motor pump unit, a base including a skirt and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured tothe upper portion of said base and having a driven shaft extendingthrough said wall, a fan secured to the protruding end of said shaft anddisposed adjacent said wall, said wall having an opening thereindirected to said fan, said motor having air passageways therethroughcommunicating with said opening, said base having a discharge opening atthe lowermost portion thereof, said fan being adapted to draw airthrough the motor passageways from the opening in said wall and todischarge same downwardly along said skirt and through the dischargeopening.

5. In a. motor pump unit, a base including a skirt and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured tothe upper portion of said base and having a driven shaft extendingthrough said wall, a fan secured to the protruding end of said shaft anddisposed adjacent said wall, a pump mechanism attached to said baseadjacent the periphery of said fan, said fan being adapted to throw airby centrifugal force against said pump mechanism to cool the same.

6. In a motor pump unit, a base including a skirt and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured tothe upper portion of said base and having a driven shaft extendingthrough said wall, a pump mechanism secured to said skirt and extendingoutwardly therefrom, means driven by said shaft for operatin said pumpmechanism, said means being disposed within said base, said pumpmechanism having a case formed with an inlet chamber and a. pressurechamber, valve means for connecting said inlet chamber with saidpressure chamber, a passageway extending between said pressure chamberand inlet chamber, an outlet valve controlling the flow of air out ofsaid pressure chamber and into said passageway, a plug in saidpassageway for holding the valve in position, a cap at the end of saidpassageway spaced from said plug to form a chamber therebetween, saidplug having a hole therein communicating with said chamber and a controldevice attached to said case and communicating with said chamber.

7. In a motor pump unit, a base including a skirt and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured .tothe upper portion of said base and having a driven shaft extendingthrough said wall, a fan secured to the protruding end of said shaft anddisposed adjacent said wall, said wall having an opening thereindirected to said fan, said base having a discharge opening at thelowermost portion thereof, said fan being adapted to draw air throughthe opening in said wall and todischarge the same downwardly along saidskirt and through the discharge opening.

8. In a motor pump unit, a base including a skirt and a wall extendingacross said skirt at the uppermost portion thereof, a motor secured tothe upper portion of said base and having a driven shaft extendingthrough said wall, a fan secured to the protruding end of said shaft anddisposed adjacent said wall, said wall having an opening thereindirected to said fan, a pump mechanism attached to said skirt adjacentthe periphery of said fan, said base having a discharge opening at thelowermost portion thereof, said fan being adapted to draw air throughthe opening in said wall and to discharge the same downwardly along saidskirt and past said pump mechanism and through the discharge opening.

9. In a motor pump unit, a motor shaft, a disc secured to said shaft,blades issuing from said disc on one side thereof and forming a fan, astub shaft issuing from the opposite side of the disc and eccentricrelative to said shaft, and a connecting rod pivoted to said stub shaftand operating the pump, said blades on the side of said disc oppositesaid stub shaft being heavier than the blades on the side of said discon which the stubshaft is disposed.

10. In a motor pump unit, a base having a compartment therein, a motorsecured to said .base and having a motor shaft extending throughmechanism to cool the same.

RICHARD T. CORNELIUS.

